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My 95' 964 with 125k runs great but have noticed the gas mileage drop down considerably. Used to get btwn 20-24mpg. Now get between 16-17 mpg in mixed use driving (mostly hiway). I've noticed dark soot build up in the tailpipe and was wondering if it meant the engine's running too rich.
I am suspecting my 02 sensor may be going bad but no check engine light on.
Will the check engine light surely go on if gone bad or on it's way out?
I just figured with 125k it may be time to replace them.
By the way, recently replaced spark plugs with Bosch Platinum Plus4.
Any feedback appreciated. Thanks.
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